The invention relates to the field of oil refining, and discloses a phenol-containing oil denitrifying treatment method. The phenol-containing oil denitrifying treatment method comprises a step of enabling phenol-containing oil to be treated to be in contact with a denitrifying adsorbent, and is characterized in that the denitrifying adsorbent is NKC-9-type macroporous strongly-acidic styrene-type cation exchange resin; in the phenol-containing oil to be treated, the nitrogen content is higher than 1.0 g/L and the phenol content is higher than 200 g/L. By the phenol-containing oil denitrifying treatment method, high-denitrifying rate denitrifying treatment can be performed on the high-nitrogen content phenol-containing oil under the condition that phenol compounds in the phenol-containing oil are not removed. According to the phenol-containing oil denitrifying treatment method, the denitrifying adsorbent is used for removing high-content nitrogen compounds in the phenol-containing oil in an adsorbing manner, and the phenol compounds are kept; and the phenol-containing oil denitrifying treatment method has the advantages of simple equipment, less investment, mild operating conditions, low cost and the like and is high in adsorptive denitrifying efficiency, and the denitrifying adsorbent is easy to recycle.